Automatic dispensing nozzle

ABSTRACT

1,040,211. Valves. DOVER CORPORATION. May 31, 1963 [May 31, 1962], No. 21781/63. Heading F2V. A fluid dispensing nozzle has an inlet 3, Fig. 1, a nozzle outlet 35 and valve member 8, loaded by a spring 11 towards the closed position. A lever 19, pivoted at 20 to a member 21, opens the valve against the spring loading and the lever may be held in the open position by a latch 22. When the valve is open, the flow through the valve causes a suction in passages 16, 30 and a chamber above a diaphragm 26 which chamber is vented through pipe 34 and orifice 37 until the orifice is immersed in liquid. The member 21 is normally held in the position shown by a latch mechanism comprising a bell-crank lever 56, Fig. 2 (not shown), pivoted at 57 and having a recess 62 on one leg 56b which engages a roller 50 on the member 21. The lever 56 is biased to the latched position by a spring 63 and its other leg 56a is engaged by a starter arm 60a of a lever 60 pivoted at 61. The other arm 60b of the lever 60 is bifurcated and engages a stem 40 of a head 44 secured to the diaphragm. When the pressure above the diaphragm is reduced owing to the inversion of orifice 37, the diaphragm rises against a spring 38 to rotate lever 60 in a clockwise direction which in turn rotates the lever 56 to release the member 21. The loading of the spring 11 causes the member 21 to move against the force of a spring 46 to allow the valve 8 to close. The lengths of the levers 60, 56 are preferably such that a velocity ratio of less than unity is provided between the input and output ends.

Nov. 9, 1965 w. D. BOONE ETAL AUTOMATIC DISPENSING NOZZLE Filed May 31, 1962 m. w n m ATTORNEYS United States Patent O 3,216,465 AUTGMATIC DISPENSING NOZZLE Wallace D. Boone and Arthur F. Briede, Cincinnati, Ohio,

assignors to Dover Corporation, Cincinnati, Ohio, a corporation of Delaware Filed May 31, 1962, Ser. No. 198,904 21 Claims. (Cl. 141-209) This invention relates generally to nozzles for the dispensing of liquids and more particularly to a dispensing nozzle adapted to be opened manually and having improved means for automatically shutting off the ow by condition responsive means.

Automatic dispensing nozzles of this general character are known and, in general, operate in a satisfactory manner. However, because of frictional forces which are inherent in any mechanical device, problems have been encountered in providing condition responsive means which will provide sufficient operating force to effect the necessary mechanical operations and at the same time, keep the physical size and weight of the device within reasonable limits. This and related problems have often resulted in the manufacture of devices which are complex and often expensive to manufacture.

Accordingly, it is an object of the present invention to provide an improved automatic nozzle construction for obviating the above diculties.

Another object of the invention is to provide an improved latch means adapted to release in response to an operating condition.

Another object is in the provision of a latch means having improved sensitivity which is inexpensive to manufacture, reliable in operation, and more positive in its action than latch means hitherto provided in the art.

Another object of the invention is to provide an improved latch means which is more sensitive in its operation with improved reliability and yet avoids over-sensitivity and the possibility of accidental release upon minor variations of an operating condition.

Still another object of the invention is to provide an interconnection in which a combination of levers and the manipulation of forces are employed to make the action of the device more certain.

Other objects and advantages will be apparent to those skilled in the art from a consideration of the following description taken in connection with the accompanying drawings in which:

FIG. 1 is a cross-sectional view, partly broken away, showing a dispensing nozzle embodying the invention.

FIG. 2 is an enlarged partial sectional view, taken in the same plane as the section in FIG. 1, and showing the condition responsive device and improved latch means in accordance with the invention.

FIG. 3 is a partial perspective view of exploded character showing the diaphragm, the interconnection unit, and the upper portion of the plunger.

Throughout the drawings, like numerals designate like parts and, while the various features of the invention are hereinafter illustrated and described as preferred embodiments, it is to be understood that such embodiments are intended to be illustrative only and not limiting since various changes and modifications can be made without departing from the invention.

Dispensing nozzles of the type to which the present invention relates are provided with automatic shut-off l 3,216,465 Patented Nov. 9, 1965.

means so that tanks or their receptacles may be lled to a pre-determined level upon the attainment of which there occurs automatically a cessation of the flow of liquid so that the constant attendance of an operator is not required. This general type of dispensing nozzle is disclosed in Pat. No. 2, 582,l--Duerr, and those skilled in the art will recognize that such dispensing nozzles comprise a lever operated main valve biased to close and provided with means for latching the operating lever in an open position. Dispensing nozzles of this type are provided with a condition responsive device, usually operable in response to a pressure which may be either positive or negative relative to atmospheric pressure. The condition responsive device is connected in an appropriatey way with the operating lever, the character of the connection being such as to release a locking or latching means in response to a desired operating condition. The above mentioned Duerr patent discloses means for producing a negative pressure or vacuum in a chamber of the condition responsive device which is vented during normal filling operations and is subjected to such vacuum when a tank or other receptacle has been illed to a pre-determined level. When thisoccurs, the condition responsive device operates to release the locking or latching means so that the main valve will close automatically under the influence of its biasing means. The present invention is an improvement on structures of this general class of dispensing nozzles.

Referring now to the drawings, a nozzle embodying the present invention comprises a housing or body 1, generally a casting formed from suitable metal. A hollow rearwardly extending portion 2 servesl both as a handle in manipulating the apparatus and also as a passageway for the uid to be dispensed, this element having at its rear end means as at 3 for connection to a flexible conduit for the liquid.

The hollow interior of the handle element 2 communicates with another hollow body portion 4 of the nozzle only through a hole 5 in a partition or septum. The main valve of the structure is located in connection with this hole; and it consists of a body 6 having a threaded upper extension 7. A sealing washer 8 of suitable resilient substance resistant to the fluid to be dispensed, lies on the at top of the body 6 and is held in place by a necked washer 9 threaded onto the body extension 7. A valve seat 10, coacting with the sealing washer 8, is machined on the body of the casting 1. The valve structure is urged downwardly by a compression spring 11 abutting against the necked washer 9 at one end and against a removable cap 12 threaded into an opening in the housing.

In the particular embodiment, the Venturi means is located at the shut-oit valve. To this end, the body 6 is given a conical taper, and it coacts with a sleeve member 13 which is recessed in the hole 5. The sleeve member has a plurality of orifices 14 about midway of its length, and these in turn connect with an annular groove 15 formed in the walls of the hole 5. A passageway 16 is drilled in the housing as shown.

The valve body 6 is Iattached to a valve rod 17 which passes downwardly through a packing gland structure 18 of any suitable type, the end of the valve rod emerging from the bottom of the housing 1.

An operating lever 19 is pivoted at its forward end to a plunger 21, the pivot being indicated at 20. An intermediate portion of the lever 19 is located in a position to contact the end of the valve rod 17 and to open the valve when the lever is raised to the position shown in dotted lines in FIG. 1. In the valve opening position the lever may be engaged at its opposite end in any one of a plurality of notches in a latching member 22 pivoted to ears on the housing portion 2. This latching member is shown in the latching posit-ion in dotted lines. It is preferably spring pressed, so that when the pivot point 20 of the lever shifts as hereinafter explained, the latch mem-ber 22 Will be released and will ily upwardly to the position partially shown in solid lines. A light spring 23 may be engaged between the housing and the lever if desired. It is usual to provide the body 1 with a guard member 1a for the lever 19 as shown.

When the valve of the nozzle is opened through the action of the lever, the fluid to be dispensed will flow from the housing portion 2 to the housing portion 4 through the valve, passing between the sleeve 13 and the valve body 6. By reason of the conical shape of the valve body, -a Venturi effect will be produced tending to draw air through the openings 14 in the sleeve.

An upper portion of the housing is coniigured to provide :a diaphragm chamber 24 which is completed by a cap member 25. A flexible diaphragm 26 is engaged and clamped between the top of the housing and the cap member as shown, the cap member being held in place by screws 27 or in any other suitable Way. Marginal portions of the diaphra-gm 26 are perforated as at 28 to pass the shanks of the screws 27. It is also perforated as at 29 so that the passageway 16 in the housing may be connected with another passageway 30 in the cap 25, whereby a v-acuum may be drawn a-bove the diaphragm in the chamber 24.

The diaphragm also is perforated marginally as at 31 to permit connection between another passageway 32 formed in the cap 25 and a passageway 33 in the body 1 to which -a tubular element 34 is attached.

This tubular element, in the exemplary embodiment, is shown as extending downwardly vWithin a spout 35 detaichably affixed to the nozzle body. The tube 34 terminates in a fitting 36 near the end of the spout, there being a passageway 37 through the spout and through the fitting 36, which passageway is open to the outer air. As has been previously explained, air entering the chamber 24 above the diaphragm 26 relieves the vacuum on the diaphragm until such time as the passageway 37 is closed off or presents -greater resistance to` the entry of air, all as is known in devices of this type.

So long as the passageway remains-open, the diaphragm will stay in a lowered position as illustrated in the drawings. A coiled spring 38 engaging between the inner surface of the cap 25 and a dished washer 39 held to the upper surface of the diaphragm tends to maintain the diaphragm in its lowermost position.

In the preferred form of the invention, av stud device 40 is used at the center of the diaphragm. About midway of its length the stud carries a washer shaped means 41v adapted to lie .beneath the diaphragm. The upper end of the stud is Ireduced and threaded as at 42; and this portion passes through a central perforation Vin the diaphragm and through the dished washer 39,` the stud beingV held in place by a nut 43. The diaphragm may be of any suitable flexible sheet material but is normally made of a rubbery substance `or a woven fabric treated with a rubbery substance so as to be gas impervious.

The lower end of the stud member is configured to provide a washer-like enlargement 44 preferably having passes through a central hollow member 47 in the portion 4 of the cast body. The spring 46 engages between the shoulder 45 on the plunger and an opposite shoulderlike conguration 48 adjacent the lowermost end of the perforation in the member 47. The spring, of course, tends to urge the plunger 21 upwardly.

The upper end of the plunger is bifurcated as at 49, and a small roller 50 is rotatably mounted on a pin 51 extending across between the bifurcations.

Plunger 21 and diaphragm 26 are releasably connected together by a latching means which comprises levers which are pivotally mounted on a base 52. The latch means will best be understood by reference to FIG. 3. Base 52 is provided with a plurality of holes 53 and is secured to the lower surface of chamber 24 by bolts 53a. Base 52 is also provided with a central hole through which the upper end of plunger 21 may move with upstanding elements 54 and 5-5 disposed on oppositesides thereof for pivotally supporting therebetween a lever 56 on a pin 57. Preferably the upper ends of elements 54 and 55 are provided with inwardly extending portions which tend to keep lever 56 in a central location relative to the axis of plunger 21. Base 52 also is provided With a second pair of upstanding elements 58 and 59 for pivotally supporting another lever 60 by a pin 61.

As is best illustrated in FIG. 2, lever 56 is a bell-crank having a leg portion 56a extending in a direction substantially normal to the axis of plunger 21 when lever 56 is in the latched position as illustrated in FIG. 2. For reasons which will appear presently, lever 56 is also provided with another leg portion^56b which extends downwardly from pivot 57 and generally normal to the leg portion 56a. Leg portion 56b is provided with a slotted or notched portion 62 for receiving roller 50 carried by plunger 21. To insure latching after a release and when plunger 21 is returned to the. position shown in FIG. 2 and to avoid accidental release from over-sensitivity and minor variations in pressure during operation, lever 56 is urged in a counter-clockwise direction by spring 63.

Frictional forces are minimized in accordance with the invention by utilizing rolling rather than sliding motion during latching and unlatching operations. This is accomplished in accordance with the invention by aligning pivots 51 and 57 with each other and preferably, as illustrated in FIG. 2, in substantial alignment with the axis of plunger 21. By utilizing an alignment of pivots as described above and a rotatable roller 50, latching or unlatching is accomplished with frictional forces minimized by the provision of a wall portion 62a which is tangent to roller 50 at the intersection of a line extending through the centers of pivots 51 and 57 and which forms the lower end of slot 62. If desired, a tip portion 62b may extend slightly beyond and to the right of the point of tangency (FIG. 2) and also may be rounded.

Because of space limitations and to avoid possible interference of the various elements during latching and unlatching operations, the depth of slot 62 is substantially equal to the radius of roller 50. However, to care for .variations due to manufacturing tolerances, jarring during operation, it may be desirable to have an end portion 62b of wall 62a extend slightly beyond the point of tangency to insure positive latching and to avoid accidental unlatching. Therefore, lever 56 can rotate, in a clockwise direction, a suiiicient amount to release roller 50 and plunger 21, and at the same time does not require the central opening in base 52 or the upper end of plunger 21 to lbe unduly large in order to avoid mechanical interference of the elements of the latch means.

In addition to the biasing action of spring 38 as noted above, this spring in` cooperation with other elements also serves to insure positive latching and to guard against accidental release when diaphragm 26 is in its lowermost position as illustrated in FIG. 2. This is accomplished by locating the lower surface of washer-like portion 44 closely adjacent or in contact with a heel or cam portion 64 of lever 56. As noted above, spring 38 exerts a strong biasing force and continuously urges diaphragm 26 and portion 44 toward their lowermost position, as illustrated in FIG. 2. This arrangement provides additional insurance against accidental unlatching because clockwise rotation of lever 56 is prevented by the relative disposition yof portion 44 and cam portion 64 and the action of spring 38 under al1 conditions of operation except when a vacuum condition causes diaphragm 26 and portion 44 to be lifted against the action of spring 38 to eifect an unlatching operation.

The lever 60 has a downwardly bent end 60a which contacts the leg 56a of lever 56. The other leg 6017 of the lever is bifurcated as most clearly shown in FIG. 3, and is engageablev with the stud on the diaphragm. It will be noted from FIGS. 1 and 2 that the bifurcations of the leg 69h lie to either side of the reduced portion 40 between the washer-like portions 41 and 44, the latter of which will move the lever 60 in a clockwise direction as shown in FIG. 2. Those skilled in the art will appreciate from the embodiment illustrated in FIG. 2 that considerable mechanical advantage is provided in the direction of the release movement of the latch part 62. This is important in making the plunger release much more sensitive, and much more responsive to a change in pressure on the upper side of the diaphragm.

In operation, an operator inserts spout 35 into the neck or filling spout of a receptacle to be filled and initiates the liow of liquid by lifting lever 19 which opens the valve against the action of spring 11. The operator then latches lever 19 in an open position by engaging its free end with an appropriate notch in latch member 22. The liow of fluid through the Venturi means, particularly sleeve member 13 tends to produce a negative pressure, or a pressure less than atmospheric pressure, in the vicinity of annular groove 15 which is communicated to the upper side of diaphragm 26 by means of ports 14, groove 15, passageways 16 and 30. This vacuum producing tendency continues so long as liquid continues to fiow through the Venturi means. However, until the tank or `receptacle into which the liquid is being dispensed has become completely full so as to cover and close off passageway 37, the vacuum producing tendency is relieved since the upper portion of diaphragm 26 is vented or connected to the atmosphere by means of passageways 32, 33, sensing tube 34, fitting 36 and passageway 37. Under such conditions tof operation, the vacuum producing tendency is not sufficient to reduce the pressure on the upper side of diaphragm 26 by an amount sufficient to overcome the downward biasing force exerted by spring 38. Accordingly, the various elements will remain in the position illustrated in FIG. 2 with plunger 21 latched in such positi-on so that the main valve will remain open and continue to dispense liquid. When the liquid in the tank or receptacle reaches a level so as to close off passageway 37, the upper side of diaphragm Z6 is no longer vented to the atmosphere; and the previously noted vacuum producing tendency now reduces the pressure on the upper side of diaphragm 26. When this occurs, diaphragm 26 is caused to move upwardly as a result of the diminished pressure in the upper portion o f chamber 24. Of course, washer-like portion 44 moves upward with diaphragm 26 thereby causing lever 60 to rotate in a clockwise direction about pin 61; and this, in turn, causes leg 60a to engage leg 56a of lever 56 thereby causing it to rotate in a clockwise direction about pin 57 and thus release plunger 21. When plunger 21 is released, it moves generally downward (FIG. 1), thus causing the main valve to be closed automatically under the action of biasing spring 11 even though the free end of lever 19 remains in latched engagement with a notch in latch 22.

After the flow of liquid has been stopped due to the closing of the main valve under the action of biasing spring 11, the operator will remove the nozzle and hence, spout 35 from the tank or receptacle thereby again reestablishing the venting connection between the upper portion of chamber 24 and the atmosphere by means of connecting passageways 32, 33, sensing tube 34, fitting 36 and passageway 37. When this occurs, the upper side of diaphragm 26 is again subjected to atmospheric pressure, and the action of biasing spring 38 causes it to return to the position illustrated in FIG. 2. In the meantime, the biasing action of spring 46 has caused plunger 21 to return to its position as illustrated in FIG. 2; and hence the various elements are again in latched position, and the nozzle is now ready for another dispensing operation. As noted heretofore, lat-ching is insured; and accidental unlatching is avoided because spring 63 urges lever 56 in a counter-clockwise direction toward latched position. In addition to this function, spring 63 also acts in opposition to any forces intending to unlatch the device and thus tends to avoid accidental unlatching which might otherwise occur through minor variations in pressure in the upper portion of chamber 24.

It will be noted that the latching and lever mechanism is a unitary device easily installed and removable from the nozzle, that the pressure force required to eifect release of the plunger is greatly diminished and that a construction has been provided that has the concurrent advantages of manufacturing economies combined with positive and reliable operation.

While a particular embodiment of the invention has been illustrated and described, it will be obvious to those skilled in the art that various changes and modifications may be made without departing from the invention, and it is intended in the appended claims to cover all such changes and modifications that fall within the true spirit and scope of the invention.

What is claimed is:

1. In an automatic dispensing nozzle, valve means, means biasing said valve means to closed position, a reciprocable member biased to a first position and movable to another position, an operating lever pivotally connected to said member for opening said valve means when said member is in said iirst position, means including sequentially actuated means biased to latch said member in said rst position, means carried by said sequentially actuated means for latching said member in said lirst position, and pressure responsive means connected to said sequentially actuated means and operable to release the latch means whereby said member is caused to move away from said first position to said other position and said valve is caused to close under the action of the valve biasing means, the sequentially actuated means being connected to said latch means and comprising a bell crank, the latch means being connected to the first leg of the bell crank and being engageable with a roller carried by said reciprocable member, the pivot center of said bell crank and the center of said roller being in co-axial alignment with the axis of movement of said reciprocable member.

2. In an automatic dispensing nozzle, valve means biased to close, a member having a first position and movable to another position, operating means connected to said member for opening said valve means when said member is in said iirst position, means including sequentially actuated means biased to latch said member in asid first position and operable to release said member in response to an operating pressure of fluid being dispensed by the nozzle and thereby cause automatic closure of the valve means under the iniiuence of its biasing action and against the biasing action of the sequentially actuated means, the sequentially actuated means comprising a bell crank having a first leg for engaging said member and having a second longer leg, a second lever having a first leg adapted to be connected to a pressure responsive device and having a relatively shorter second leg in engagement with second leg of said rst lever, the longer leg of said second mentioned lever being bifurcated and having a releasable connection with a stud on said diaphragm, the said stud having a reduced intermediate portion embraced by the bifurcations of said second lever, and washer shaped elements on either of said reduced portion.

3. The structure claimed in claim 2 wherein said first mentioned lever has a camming surface near its pivot point, which camming contacts the outer washer shaped element of said stud when said lever moves toward release position whereby a positive upward pressure is exerted upon said stud.

4. The structure claimed in claim 3 including a resilient means urging said first mentioned lever to the latching position, the latching means on said lever embodying a slant-wise surface for automatic re-engagement with said roller.

5. The structure claimed in claim 4 wherein said plunger is provided with a shoulder and in which a coiled spring surrounding said plunger and engaging said shoulder tends to urge said plunger into latching position.

6. The structure claimed in claim 5 wherein said levers are mounted on ears on a fixed perforated to receive an end of said plunger and detachably mountable upon the body of said nozzle within said diaphragm chamber.

7. An automatic dispensing nozzle comprising body means having passage means therethrough for conducting fluid, valve means biased to close said passage means, a member supported by said body means and movable from a first position to a second position, operating means operatively connected to said member and valve means for opening said valve means when said member is in said first position, releasable holding means for holding said member in said first position comprising latch means and first and second levers acting in series pivoted to said body means, said latch means releasably connecting said first lever to said member, and fluid pressure operated motor means adapted to move said holding means to a released position whereby said member may move to said second position and said valve means may move to close said passage means.

8. An automatic dispensing nozzle as defined in claim 7, wherein said holding means comprises first and second levers pivoted to said body means and located between said motor means and said member, latch means to releasably connect said first lever to said member for holding said member in said first position, said second lever being operatively connected between said first lever and said motor means so that operation of said motor means in one direction will cause said levers to release said latch means, and said levers being so arranged as to increase the mechanical advantage of said motor means in operating said latch means.

9. An automatic dispensing nozzle as defined in claim 8, wherein said member is mounted for reciprocal movement in said body means along a linear path, said latch means and the pivotal axis of said first lever located in alignment with said path.

10. An automatic dispensing nozzle as defined in claim 8, wherein said levers are both pivotally connected to said body means at intermediate portions thereof, one end of said second lever engaging one end of said first lever, the other end of said first lever connected to said latch means, and the other end of said second lever releasably connected to said motor means.

11. An automatic dispensing nozzle as defined in claim 9, .wherein said motor means comprises a flexible diaphragm centered on said path, and spring means urging said diaphragm toward said levers along said path.

12. An automatic dispensing nozzle as defined in claim 7, including a ratchet member pivotally connected to said body means and engageable with said operating means so as to selectively hold the operating means in a plurality of valve opening positions.

13. A dispensing device including body means having passage means therethrough for conducting fluid, a spout connected to one end of said passage means, valve means S biased to close said passage means, a member supported by said body means and movable from a first position to a second position, operating means operatively connected to said member and valve means for opening said valve means when said member is in said first position, releasable holding means for holding said member in said first position and fluid pressure operated motor means adapted to move said holding means to a released position whereby said member may move to said second position and said valve means may move to close said passage means so as to prevent flow of fluid through said passage means and spout, said holding means including a plurality of movably mounted bell crank levers connected in series between said motor means and said member so as to increase the effective mechanical advantage of said motor means.

14. A device is defined in claim 13 including a first conduit extending through a wall of said spout and connected to said motor means, and a second conduit connecting said valve means to said motor means.

15. A dispensing device including body means having passage means therethrough for conducting fluid, a spout connected to one end of said passage means, valve means biased to close said passage means, a member supported by said body means and movable from a first position to a second position, operating means operatively connected to said memberand valve means for opening said valve means when said member is in such first position, releasable holding means for holding said member in said first position and fluid pressure operated motor means adapted to move said holding means to a released position whereby said member may move to said second position and said valve means may move to close said passage means, said member having a longitudinal axis and slidably mounted in said body means for reciprocal movement along said axis, said holding means comprises a pair of bell crank levers pivotally mounted on said body means and operatively connected in series so as to increase the effective mechanical advantage of said motor means, and latch means between one end of one of said levers and one end of said member.

16. A device as defined in claim 15, wherein said latch means includes a roller rotatably mounted in a slot formed in said"one endy of said member and a projection engageable with said roller secured to said one end of said one lever, first pivot means securing an intermediate portion of said one lever to said body means, said pivot means and roller being in alignment with said longitudinal axis.

17. A device as defined in claim 16, wherein the other lever is pivotally connected at an intermediate portion thereof to said body means by a second pivot means which is radially spaced from said longitudinal axis, said other lever located between said one lever and said motor means.

18. A device as defined in claim 17, wherein said motor means includes a diaphragm extending normal to said axis, a lug secured to the center of said diaphragm and the axis of said lug coinciding with said longitudinal axis, a head secured to said lug, said lug being engageable with said one end of said one lever, and spring means urging said lug into engagement with said one end of said one lever so as to rotate said one lever to cause said projection to engage said roller.

19. A device as defined in claim 18, wherein said projection is provided with a surface engageable with said roller, said surface extending substantially perpendicular to said longitudinal axis when engaged with said roller.

20. A device as defined in claim 19, wherein said other lever has one end engageable with the other end of said one lever, the other end of the other lever being bifurcated and located between said head and said diaphragm.

21. An automatic dispensing nozzle comprising body means having passage means therethrough for conducting fluid, valve means biased to close said passage means, a member supported by said body means and movable in a reciprocable manner between a first position and a second position, operating means operatively connected to said member and valve means for opening said valve means when said member is in said first position, releasable holding means for holding said member in said rst position comprising a bell crank, a spring engaging said bell crank and urging the same to a position in which it functions to hold said member and fluid pressure operated motor means for moving said holding means to a released position whereby said member may move to said second position and said valve means may move to close said passage means, said motor means including a lug engaging said bell crank which prevents said holding means from References Cited by the Examiner UNITED STATES PATENTS 3/44 Hammand 141-209 3/59 McCarty 141-209 LAVERNE D. GEIGER, Primary Examiner.

LOUIS I. DEMBO, Examiner. 

7. AN AUTOMATIC DISPENSING NOZZLE COMPRISING BODY MEANS HAVING PASSAGE MEANS THERETHROUGH FOR CONDUCTING FLUID, VALVE MEANS BIASED TO CLOSE SAID PASSAGE MEANS, A MEMBER SUPPORTED BY SAID BODY MEANS AND MOVABLE FROM A FIRST POSITION TO A SECOND POSITION, OPERATING MEANS OPERATIVELY CONNECTED TO SAID MEMBER AND VALVE MEANS FOR OPENING SAID VALVE MEANS WHEN SAID MEMBER IS IN SAID FIRST POSITION, RELEASABLE HOLDING MEANS FOR HOLDING SAID MEMBER IN SAID FIRST POSITION COMPRISING LATCH MEANS AND FIRST AND SECOND LEVERS ACTING IN SERIES PIVOTED TO SAID BODY MEANS, SAID LATCH MEANS RELEASABLY CONNECTING SAID FIRST LEVER TO SAID MEMBER, AND FLUID PRESSURE OPERATED MOTOR MEANS ADAPTED TO MOVE SAID HOLDING MEANS TO A RELEASED POSITION WHEREBY SAID MEMBER MAY MOVE TO SAID SECOND POSITION AND SAID VALVE MEANS MAY MOVE TO CLOSE SAID PASSAGE MEANS. 